Exactly, that is exactly what Yamato's story arc is: an ironic one
While it's true Kaido does want Yamato to be Wano's guardian deity, it's argumentation is only based on the will to not let Yamato gain her freedom.
We dont know that, at least not if its ONLY because of that, his reasoning is very much a mystery
Basically, Yamato will CHOOSE to protect Wano, not the opposite. Much like Oden choosed to come back to protect Wano
Ok, where are the hints or set up for that, the basis of this theory?
Much like Oden choosed to come back to protect Wano.
Its HEAVILY implid that Oden came back and decided to stay not only because of his family and so on, but because of what he found out about the prophecy
and Yamato knows about that prophecy and still wants to go, so I cant see how she would mimic that when Momo is already fulfilling that part of the prophecy
Concerning the dialogue of Yamato and Luffy, I analysed it
here
"Here Yamato implies that he wants to go on the Sunny because of he followed his logic (because Luffy is Ace's brother). Implying that the reason is not Luffy but his reasonning."
No, we know now that its not just because of that reasoning, she wants to go with Luffy for at least 3 reasons
-Ace's brother
-Joy boy
-Actual respect for his achievements, thats why she even knows the name of his crewmates already
"For example: Robin forced Luffy's hand.. yes.. but for a good reason: Luffy saved her, he was therefore responsible for her being alive and without nowhere to go. "
I fail to see how this instance was fine but not Yamato's request, that was way more forceful while Yamato just had a weird reasoning, also Oda purposefully not giving us an answer instead of a straight up "no" makes it even less unlikely to be read in such manner
Then you proceed to show examples of Oda subverting expectations, but in your examples(Vivi and Sanji) both had a simultaneous build up for said subversion, setting up the ground for it
So much that I would hardly call Sanji's case a subversions at all, and the other examples you gave are hardly comparable to these ones since they were plot related and not regarding a character doing or not doing something specifically
"A good reader of One Piece will know that all the mugiwara will follow Luffy because of HIM FIRST"